广东省福寿螺形态性状变异及其与体质量的关系

【背景】福寿螺是危害极其严重的入侵我国的水生生物,目前利用相关分析、通径分析对福寿螺形态性状变异的研究较少。【方法】随机采集7个地区的福寿螺(雌雄比例差别很大),测量其壳高、壳宽、口宽、层高4个形态性状和体质量,采用相关分析、通径分析方法计算福寿螺的各形态指标变异系数、相关系数和通径系数,剔除对体质量影响不显著的指标,确定每个地区与体质量最相关的指标。【结果】除惠州之外,其余地区福寿螺的壳高和壳宽与体质量的相关性较高,且口宽与壳高共同作用对体质量的直接影响很大。【结论与意义】此结果为研究不同生境、不同温度下福寿螺的形态性状变异程度奠定了基础,同时为福寿螺形态鉴定、分类及其灾害预测预报提供了基础数据。

Correlation analysis of morphometric traits and body mass of the golden apple snail Pomacea canaliculata in Guangdong Province, China

Background] The apple snail, Pomacea canaliculata Lamark is an exotic invasive pest in China. The study on the rela- tionship between morphological characteristics and body mass quantified by correlation analysis and path analysis was few. Meth- od ] P. canaliculata in 7 regions of Guangdong Province were collected by random with huge sex ratio, four morphometric traits （ shell height, shell width, mouth width and whorl height）, and body mass were measured. The relationship between morphological charac- teristics and body mass was quantified by correlation analysis, path analysis and multiple regression analysis. No significant morpho- logical characteristics in multiple regression equation were deleted, thereby the most corrected variables with body mass were select- ed from different regions. Result]The results showed that shell height, and width, had the hightest relationship with body mass, significant at all locations, except for Huizhou City. Shell mouth width and shell height had the strongest effect on body mass. Conclusion and significance ] This study will have important implications on apple snails in terms of morphological identification, classification and damage forecasting in different habitats.